HardOCP - Kyle Bennett's creation. Great site. A legend in the OCing realm.

Sharky Extreme - Good site, long reviews (but thorough). Weekly CPU price chart.

Overclockers.com - Great site with an overclocking database, lots of good articles and guides.

Chicks Hardware - Great site with lots of reviews, news, articles. Lots of updates.

Anandtech - Good site with daily news and good reviews.

G3D: Gaming in 3D - Great site.